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+User libraries is a sub-package where useful Python modules contributed by users are stored.
+
+**********
+stltovoxel
+**********
+
+Information
+===========
+
+**Author/Contact**: Kartik Bansal (kartikbn21000@gmail.com), India
+
+This module provides the ability to directly model real objects without having to build their geometries manually using geometry primitives such as the ``#edge``, ``#plate``, ``#box`` etc.. commands. It specifically provides a tool to convert a `STL file <https://en.wikipedia.org/wiki/STL_(file_format)>`_, which can be produced by many CAD software packages, to a voxelised mesh (FDTD Yee cells) which is saved as a geometry file in HDF5 format suitable for directly importing into gprMax. 
+
+This module was created as part of the `Google Summer of Code <https://summerofcode.withgoogle.com/>`_ programme 2021 which gprMax participated. The module is based on the `stl-to-voxel <https://github.com/cpederkoff/stl-to-voxel>`_ Python library by Christian Pederkoff.
+
+**License**: `Creative Commons Attribution-ShareAlike 4.0 International License <http://creativecommons.org/licenses/by-sa/4.0/>`_
+
+**Attribution/cite**: TBC
+
+Module overview
+===============
+
+* ``stltovoxel.py`` is the main script which should be executed to convert a STL file to a voxelised mesh which is saved as a geometry file in HDF5 format suitable for directly importing into gprMax.
+* ``examples`` is a folder containing example STL files as well as gprMax input files that can be used to import the resulting HDF5 geometry files.
+* ``convert.py``, ``perimeter.py``, ``slice.py`` are modules adapted from the `stl-to-voxel <https://github.com/cpederkoff/stl-to-voxel>`_ Python library by Christian Pederkoff.
+* ``license.md`` is the license for the `stl-to-voxel <https://github.com/cpederkoff/stl-to-voxel>`_ Python library by Christian Pederkoff.
+
+How to use the module
+=====================
+
+The main script is ``stltovoxel.py`` which should be run at the command line and takes three arguments:
+
+* ``stlfilename`` is name of STL file to convert including the path.
+* ``-matindex`` is an integer which represents the index of the material to be used from the materials file which will accompany the generated geometry file (HDF5 format).
+* ``-dxdyz`` is the spatial discretisation of the generated voxelised mesh. It should be given as three floating point numbers.
+
+The physical dimensions of the voxelised object will depend on the size of the object in the original STL file and the spatial discretisation chosen.
+
+Example
+-------
+
+To create a voxelised mesh (HDF5 geometry file) from the ubiquitous `Stanford bunny <https://en.wikipedia.org/wiki/Stanford_bunny>`_ STL file, using a spatial discretisation of 1mm and selecting material index 2 from a materials file:
+
+.. code-block:: none
+
+    python -m user_libs.stltovoxel.stltovoxel user_libs/stltovoxel/examples/stl/Stanford_Bunny.stl -matindex 2 -dxdydz 0.001 0.001 0.001
+
+Since the number of voxels are 108 x 88 108 and the spatial discretisation chosen is 1mm, the physical dimensions of the Stanford bunny when imported into gprMax will be 0.108 x 0.088 x 0.108mm.
+
+The following is an example of a ``materials.txt`` file that can be used with the generated geometry file (HDF5 format) when importing into gprMax. Since ``-matindex`` is set to 2 the material with name ``hdpe``, i.e. a plastic, will be used.
+
+.. literalinclude:: ../examples/materials.txt
+    :language: none
+    :linenos:
+
+The following Python script (using the gprMax API) can be used to import the generated geometry file ``Stanford_Bunny.h5`` and materials file ``materials.txt`` into a gprMax model:
+
+.. literalinclude:: ../examples/bunny.py
+    :language: python
+    :linenos:
+
+.. figure:: images/stanford_bunny_stl.png
+    :width: 600 px
+
+    Image of the Stanford bunny STL file
+
+.. figure:: images/stanford_bunny.png
+    :width: 600 px
+
+    FDTD geometry mesh showing the Stanford bunny
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